TextBook Solutions
- What are the problems caused by the non-biodegradable wastes that we generate? The problems caused by non-biodegradable wastes are: The cause biomagnification. They increase pollution. They make environment unclean. The... 1
- What is biological magnification? Will the levels of this magnification be different at different Biological magnification is defined as the phenomena of accumulation or increase in the concentration of some toxic substances at each troph... 1
- Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Impact of removing all organisms of a trophic level is different for different trophic levels. For example, if we remove producers from a fo... 1
- What will happen if we kill all the organisms in one trophic level? If we kill all the organisms of one trophic level it will create an imbalance in the ecosystem. As an Example, In a food chain Grass → Dear... 1
- Which of the following are environment-friendly practices? (a) Carrying cloth-bags Correct option is d) All of the above 2
- Which of the following constitute a food-chain? (a) Grass, wheat and mango Correct option is b) Grass, goat and human 2
- Which of the following groups contain only biodegradable items? (a) Grass, flowers and leather The correct option is c) Fruit-peels, cake and lime-juice 2
- How can you help in reducing the problem of waste disposal? Give any two methods. We can help in reducing the problem of waste disposal by these methods: By separating biodegradable substances from non-biodegradable substa... 1
- What is ozone and how does it affect any ecosystem? Ozone (O3) is a molecule, made up of three atoms of oxygen. Ozone (O3) forms a layer in the upper atmosphere. It is very essential for the l... 1
- What is the role of decomposers in the ecosystem? Various role played by decomposers in the ecosystem are: They clean the environment. They decompose biodegradable substances into useful sub... 1
- What are trophic levels? Give an example of a food chain and state the different trophic levels in it. The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels. The producers for... 1
- Give any two ways in which non-biodegradable substances would affect the environment. Non-biodegradable substances affect the environment by: They contaminate soil and water resources as they cannot be decomposed by micro-orga... 1
- Give any two ways in which biodegradable substances would affect the environment. Biodegradable substances affect the environment by: The biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be... 1
- Why are some substances biodegradable and some non-biodegradable? Substances are classified as biodegradable and non-biodegradable because some substances can be decomposed by microorganisms and some cannot... 1
- On the basis of the issues raised in this chapter, what changes would you incorporate One should incorporate the following changes in life-style in a move towards sustainable use of our resources: Stop cutting trees and practi... 1
- What can you as an individual do to reduce your consumption of the various natural resources? Natural resources such as water, forests, coal and petroleum, etc. are important for the survival of human beings. The ways in which we can... 1
- How can you as an individual contribute or make a difference to the management of (a) forests and wildlife (a) Forest and wildlife: We should protest against the cutting of trees (deforestation). We should protest against the poaching of wild anim... 1
- We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife The forest department of the government should have the authority to decide the management of forest produces. This is because the forest de... 1
- Can you suggest some changes in your school which would make it environment-friendly? Changes that can be undertaken in our schools to make it environment friendly are: Electricity can be saved by switching off lights and fans... 1
- What changes would you suggest in your home in order to be environment-friendly? Changes that can be undertaken in our homes to be environment-friendly are: Switch off the electrical appliances when not in use. Turn the t... 1
- Compare the above system with the probable systems in hilly/mountainous areas or plains or plateau regions. In plains, the water harvesting structures are crescent-shaped earthen embankments. These are low, straight, and concrete. In hilly regions,... 1
- Suggest some approaches towards the conservation of forests. Some approaches towards the conservation of forests are: Conversion of forests into national parks, sanctuaries. To take help of local peopl... 1
- Why should we conserve forests and wildlife? We should conserve forests and wildlife because they are essential for us in following terms: Forest provide us oxygen, they cause rain fall... 1
- Why do you think there should be equitable distribution of resources? Natural resources of the Earth must be distributed among the people uniformly so that each and every one gets his share of the resource. Hum... 1